What is the difference between the skeleton oil seal, graphite seal, and mechanical seal of a pump？

The skeleton oil seal, graphite seal, and mechanical seal of the pump are common sealing forms, and there are the following differences between them:

Structure and principle: The skeleton oil seal is composed of a metal skeleton and a rubber sealing ring, which is pressed onto the shaft through compression. Graphite seal is composed of graphite ring, packing, and metal parts, with graphite ring being the main sealing component. Mechanical seals are composed of fixed rings, rotating rings, packing, springs, etc. They prevent leakage by friction sealing between the rotating ring and the fixed ring.

Applicable working conditions: Skeleton oil seals are suitable for working conditions with high temperatures and corrosive media, such as the chemical industry. Graphite sealing is suitable for high-speed rotating equipment and pumps under high temperature and high pressure conditions. Mechanical seals are suitable for various working conditions, including high temperature, high pressure, low temperature, and corrosive media.

Lifespan and maintenance: The lifespan of skeleton oil seals is relatively short, and they are susceptible to wear and aging during operation, requiring regular maintenance and replacement. The lifespan of graphite seals is relatively long, and graphite rings have good corrosion resistance and high temperature resistance, making maintenance relatively simple. The lifespan of mechanical seals is relatively long, but they have high requirements for the working environment and require regular inspection and maintenance.

Sealing effect: Mechanical seals are more stable and reliable in terms of sealing effect, capable of achieving zero leakage and suitable for high-precision sealing requirements. Skeleton oil seals and graphite seals may have some leakage in sealing effect compared to mechanical seals.

Overall, mechanical seals have the best sealing effect and are suitable for various harsh working conditions; Graphite sealing is suitable for high temperature and high pressure working conditions; The skeleton oil seal is suitable for general working conditions, but requires regular maintenance and replacement. The choice of sealing form should be determined based on specific working conditions, medium characteristics, and requirements, and combined with experience and actual situations.

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